N-(2-{8 3-hydroxy-3-phenyl-2-phthalimidinyl{9 -ethyl)-sulfonamides

ABSTRACT

Novel compounds have been prepared which have useful pharmacological activity as well as intermediates for their production. Some of the processes have utility for the production of other pharmacologically active compounds. The active compounds of this invention are those of the following formulas:   WHEREIN R1 is selected from the group consisting of phenyl, monohalophenyl, dihalophenyl, mono(lower)alkylphenyl, di(lower)alkylphenyl, trifluoromethylphenyl, mono(lower)alkoxyphenyl, di(lower)alkoxyphenyl, thienyl, pyridyl, furyl, and tetrahydro-2-naphthyl; R2 is selected from the group consisting of hydrogen, halogen, amino, (lower)alkylamino, (lower)alkyl and (lower) alkoxy; R3 is hydrogen when R2 and R3 are dissimilar and when R2 and R3 are the same they are both selected from the group consisting of hydrogen, halogen, (lower)alkyl and (lower)alkoxy; R4 and R5 are lower alkyl and attached to the same carbon atom; X is the anion portion of a pharmacologically acceptable acid-addition salt.

United States Patent Sulkowski et al.

[ 51 Feb. 4,1975

[ N-(2-[3-HYDROXY-3-PHENYL-2- PHTHALIMlDlNYL]-ETHYL)- SULFONAMIDES [73] Assignee: American Home Products Corporation, New York, NY.

[22] Filed: Aug. 14, 1972 [21] Appl. No.: 280,634

Related U.S. Application Data [62] Division of Ser. No. 10,984, Feb.

abandoned.

[52] U.S. Cl..... 260/325 PH, 260/294.8 C, 260/309,

260/309.6, 260/309.7, 424/274, 424/273 [51] Int. Cl C07d 27/50 [58] Field of Search....'. 260/325, 325 PH [56] References Cited UNITED STATES PATENTS 3,634,452 l/l972 Fischer et al. 260/325 Primary Examiner-Joseph A. Narcavage [57] ABSTRACT Novel compounds have been prepared which have useful pharmacological activity as well as intermediates for their production. Some of the processes have utility for the production of other pharmacologically active compounds. The active compounds of this invention are those of the following formulas:

1 i R2 R5 HX R3 i N u :1 v

| and ii 3 -f OH wherein R is selected from the group consisting of phenyl, monohalophenyl, dihalophenyl, mono(lower- )alkylphenyl, di(lower)alkylphenyl, trifluoromethylphenyl, mono(lower)alkoxyphenyl, di(lower- )akoxyphenyl, thienyl, pyridyl, furyl, and tetrahydro- Z-naphthyl; R is selected from the group consisting of hydrogen, halogen, amino, (lower)alkylamino, (lower- )alkyl and (lower) alkoxy; R is hydrogen when R and R are dissimilar and when R and R are the same they are both selected from the group consisting of hydrogen, halogen, (lower)alkyl and (lower)alkoxy; R, and R are lower alkyl and attached to the same carbon atom; X is the anion portion of a pharmacologically acceptable acid-addition salt.

7 Claims, No Drawings 1 N-(2-[3-HYDROXY-3-PHENYL-2- PHTHALVIMIDINYL]-ETHYL)-SULFONAMIDES This is a division of application Ser. No. 10,984 filed Feb. l2 1970 now abandoned.

This application discloses processes which may be applicable in the production of compounds disclosed in the US. Pat. application, Ser. No. 757,792, filed Sept. 5, I968. The novel compounds of this invention exhibit antidepressant activity but, unlike the compounds disclosed in Ser. No. 757,792, do not possess anorexiant activities at therepeutic dosages.

This invention relates to pharmacologically active 5-aryl-2,3-dihydro-2,2(or 3,3)dimethyl-5H- imidazo[2,l-a]isoindol-5-ols and 2(4,4(or 5,5)dimethyl-2-imidazolin-2-yl)benzophenone acid addition salts and processes for their production. The intermediate compounds produced by the processes of the invention are also novel.

The new and novel compounds which are included within the scope of this invention are represented by the following formulae:

a l R2 N 5 H .HX 3 3 (i= 3 R R /X 4 R2 I N45? and R3 R3 (III).

wherein R is selected from the group consisting of phenyl, monohalophenyl, dihalophenyl, mono(lower)alkylphenyl, di(lower)alkylphenyl, trifluoromethylphenyl, mono(lower)alkoxyphenyl, di(lower)alkoxyphenyl, thienyl, pyridyl, furyl and tetrahydro-Z- naphthyl; R is selected from the group consisting of hydrogen, halogen, amino, lower alkylamino, lower alkyl and lower alkoxy; R is hydrogen, when R; and R are dissimilar and when R and R are the same they are both selected from the group consisting of hydrogen, halogen, lower alkyl and lower alkoxy; R and R are selected from the group consisting of hydrogen and lower alkyl with the provisos that in formulae (1), (II) and (lll) both R, and R are lower alkyl and in formulae (l) and (II) both R, and R are attached to the same carbon atom; R is selected from the group consisting of hydrogen, lower alkylsulfonyl, phenylsulfonyl, monohalophenylsulfonyl, dihalophenylsulfonyl, mono- (lower)alkylphenylsulfonyl, di(lower)alkylphenylsulfonyl and lower alkoxyphenylsulfonyl with the proviso that in formula (IV) R is other than hydrogen; and X is an anion portion of a pharmacologically acceptable acid-addition salt.

As employed herein the term (lower)alkyl is meant to include straight and branched chain hydrocarbon moieties of from one to about four carbon atoms such as methyl, ethyl, propyl, i-propyl and butyl. The term (lower)alkoxy is used to include hydrocarbonoxy groups which contain from one to about six carbon atoms such as methoxy, ethoxy, propoxy, butoxy and hexoxy. The term halogen" and "halo" as used herein are meant to include bromine, fluorine, chlorine and iodine.

Those skilled in the art will appreciate that the compounds of Formulas l and II are tautomers. It has been found that the base form (I) exists as the tricyclic imidazoisoindole form and the acid-addition salt (ll) exists as the benzophenone form. The nature of the reaction by which the compounds are prepared does not allow the position of the gem dialkyl groups to be fixed with certainty. When the compound exists as the benzophenone type form, it is impossible to fix the position of the gem dialkyl groups because of the proton shift due to the NHC=N group. Hence, the 2 (gem dialkyl-Z-imidazolin-Z-yl)benzophenone acid-addition salts are named as 4,4(5,5 )dialkyl substituted compounds. This is in conformity with the nomenclature for imidazole type compounds set forth in Heterocyclic Compounds, R.C. Elderfield, Editor, Vol. 5, pp 198, 199 and 238, John Wiley and Sons, Inc., New York, 1957. When the imidazoisoindol-ol form of benzophenone tautomer is formed, the tautomerism of the HN-C=N moiety does not permit any absolute prediction as to positioning of the gem dialkyl group in the I imidazoisoindol-form. When the steric influence of the gem dialkyl group is considered, the probability is great that the product obtained is a 2,2-dialkyl compound. Gas chromatographic studies indicate a single compound is isolated and not a mixture of the 2,2-dialkyl The compounds of Formulas l and ll may be prepared by contacting the appropriate phthalimidine with sulfuric acid and subsequently treating the product with base:

R3 OH (VII) 4 wherein R R R R R and R are the same as herein above defined. In addition, this method is operable for the production of compounds wherein R and R are hydrogen.

Concentrated sulfuric acid of 75-100% strength is comployed in converting compound V to compound Vl. Generally, no criticality attaches to the use of a par ticular basic compound when the sulfate salt is treated to prepare the imidazoisoindol-ol base form. For example, sodium carbonate, sodium hydroxide, potassium hydroxide or sodium bicarbonate may be used. When the tautomeric acid-addition salt is prepared, the preferred method is to saturate a lower alkanolic solution of the base form of the compound with hydrogen chloride gas. Suitable lower alkanols include methanol, ethanol and propane].

The intermediate sulfonated phthalimidines may be prepared as follows:

-1/2 a so O u R 5 N-CHg-C-NHR R3 OH 5 wherein R,, R R R R and R are the same as hereinabove defined and X is a halogen atom. In addition, R and R may hydrogen when intermediates are being prepared for making compounds wherein the imidazo moiety in unsubstituted. The sulfonation is usually conducted in pyridine although other suitable organic or aqueous solvents with a base such as sodium carbonate or triethylamine may be employed. The reactants are refluxed for about 12 to 24 hours, then the solvent is evaporated and the residue is partitioned between water and an immiscible organic solvent such as ethyl acetate, ether. chloroform or benzene. The organic portion is separated and then the solvent is evaporated. The residue is recrystallized from a lower alkanol such as methanol, ethanol or propanol to yield the sulfonated product.

The phthalimidines may be obtained by the hydrolysis of an imidazoisoindolone or by reaction of the l -acid chloride of an o-aroyl benzoic acid with the appropriate l,l-dialkylethylenediamine:

wherein R,. R R R and R are the same as hereinabove defined.

The imidazoisoindolones may be prepared by refluxing the reactants in a water immiscible organic solvent such as toluene, benzene, xylene. chloroform, carbontetrachloride, pyridine, etc. The flask should be equipped with a water separator and the usual period of reflux is 12-24 hours. The solution is then extracted with water and the organic layer is evaporated in vacuo to a solid residue. On recrystallization from ethanol, ethyl acetate, hexane-acetone, chloroform, etc. the imidazoisoindolene is obtained in good yield.

The compounds of FORMULAS l and ll are pharmacologically active as antidepressant agents when administered orally to mammals.

The compounds have been orally administered to a group of six mice (3 males and 3 females). One hour later the animals are challenged with reserpine, 2.5

mg./kg. administered intraperitoneally. The degree of wherein R,, R R R R and R are the same as hereinabove defined.

The imidazoisoindolone compounds may be pre pared by condensing a l,l-dialkylethylenediamine with the appropriate o-(substituted carbonyl)benzoic acid:

ptosis for each eye was determined at one and two hours post treatment. Prevention of reserpine ptosis is an indication of antidepressant activity. See Rubin et al. J.P.E.T. 120, (I957). Controls are simultaneously run with amphetamine and Tofranil. The compounds of FORMULAS l and ll were found to be active in mice at a dose of about 0.95 mg./kg. when administered orally.

The compounds have also been tested for anorexiant activity according to the following procedure:

Male Charles River rats between 120 and grams are trained to drink sweetened condensed milk from a graduated drinking tube. After a short learning period the animals are placed on a routine of water ad lib for 24 hours, standard laboratory chow for 22 hours and sweetened condensed milk for 2 hours. The volume of milk consumed is measured at 30 minutes as well as 2 hours. The animals are weighed every day. This schedule is maintained 5 days a week over a period ofseveral months. Drug trials are run on Thursdays and changes in milk consumed and 24 hour weight changes are compared to the average of the two days before drug administration. Animals are tested as groups of six and one grup is give saline each week to serve as controls. Drugs are usually administered intraperitoneally in saline or orally in water.

The compounds of the invention did not inhibit appetite when treated at dosage levels of up to 10 mg./kg of body weight, P. O.

The following examples have been added to illustrate but not to limit the scope of the invention:

EXAMPLE I A solution of 50 g. of o-(p-chlorobenzoyl)benzoic acid, 100 ml. of toluene and 40 ml. of 1,2-diamino-2- methylpropane is refluxed in a flask equipped with a water separator. After refluxing for 17 hours, the solution is extracted with water and the organic portion evaporated in vacuo to a solid residue. On recrystallization from ethanol, there is obtained 9b-(pchlr0phenyl)-1,2,3,9b-tetrahydro-2,2-dimethyl-SH- imidazo[2,1 a]isoindol--one, m.p. l32-134 C.

Anal. Calcd for C,,,H,,C1N,O: C, 69.34; H, 5.17; N, 8.99;

Found: C, 69.21; H, 5.40; N, 11.65;

EXAMPLE 11 A solution of 50 g. of o-(p-fluorobenzoy1)benzoic acid, 150 ml. of toluene and 75 ml. of l,2-diamino-2- methylpropane is refluxed in a flask equipped with a water separator. After refluxing for 19 hours the solution is extracted with water. The toluene layer is evaporated to dryness and the residue is recrystallized from aqueous alcohol to obtain 9b-(p-fluorophenyl)- l ,2,3,9b-tetrahydro-2,2-dimethyl-5H-imidazo[2,1- a]isoindol-5-one, m.p. lO8-110 C.

Anal. Calcd for c H N FOz C, 7

295; Found: C. 72.83

Similarly, 9h-(3-bromo-p-tolyl)-1,2,3,9b-tetrahydro- 2,Z-dimethyl-S-H-imidazol2,1-ulisoindol-S-one; 1,2,3- ,9h-tetrahydro-2,2,7-trimethyl-9b-phenyl-5H- imidazol 2,1-u lisoindol-S-one; and l,2,3,9b-tetrahydro- 2,2-dimethyl-9h-phenyl-9-propyl-5H-imidazo[2,lalisoindol-S-one are prepared.

EXAMPLE 111 A solution of 40 g. of o-benzoylbenzoic acid, 60 ml. of 1,Z-diamino-2-methylpropane, and 150 ml. of toluene is refluxed in a flask equipped with a water separator. After refluxing eight hours the solution is extracted with water and the toluene portion is evaporated to dryness. The residue is recrystallized from ethanol to obtain 1,2,3 ,9b-tetrahydro-9b-pheny1-2,2-dimethyl- 5H-imidazo[2,l-a]isoindol-5-one, m.p'. 146-l49 C.

Anal. Calcd for C H N O: C. 77.67; H, 6.52; N, 10.07. Found: C. 77.35; H. 6.88; N, 10.15.

Repeating the above procedure, the following compounds are prepared:

9b-(3,4-dichlorophenyl)-1,2,3,9b-tetrahydro-2,2-

' dimethyl-S H-imidazo[ 2 1 -a]isoindol-5 -one;

2,2-diethyl-9b-(p-fluorophenyl)-1,2,3,9b-tetrahydro- 5-H-imidazo[2,l-alisoindol-S-one; and

1,2,3 ,9b-tetrahydro-2,2-dimethyl-9b-( p-tolyl )'5H- imidaz0[ 2,1 -alisoindo1-5-one.

EXAMPLE IV A solution of 35 g. of o-(p-bromobenzoyl)benzoie acid, ml. of toluene, and 50 ml. of 1,2-diamino-2- methylpropane is refluxed in a flask equipped with a water separator. After refluxing 6 hours, the solution is extracted with water. The toluene layer is evaporated to dryness in vacuo. On recrystallization from dilute alcohol there is obtained 9b-(p-bromophenyl)-1,2,3,9htetrahydro-2,2-dimethyl-5H-imidazol 2,1 -a]isoindo1 5-one, m.p. 133-135 C.

Anal. Calcd for c H N Broz C, 60.51; H, 480i N, 7.84, Found: C, 60.80; H, 4.91; N, 7.91.

EXAMPLE V When the procedure of Examples l-lV is repeated to condense an appropriate 1,1-dia1kylethylene diamine with a o-ketoacid, the following 2,2-dialky1-9/1-aryl- 1,2,3,9h-tetrahydro-5H-imidazo[2,1-alisoind0l-5-ones are produced:

wherein R., R R R and R are as follows:

piodophenyl 7-bromo hydrogen methyl methyl 3.4-dimethylphenyl 8-methoxy hydrogen methyl ethyl p-methoxyphenyl 7-ehloro lhehloro methyl methyl trifluoromethylphcnyl 7-methylamino hydrogen ethyl ethyl 2.5-dihromophenyl 7-methyl X-methyl methyl methyl 3,4-dimethoxyphenyl o-ethoxy hydrogen methyl methyl Z-thienyl 7-methoxy R-methoxy butyl butyl p-propoxyphenyl 9-iodo hydrogen methyl methyl Z-pyridyl 7-fluoro 8-fluoro methyl hulyl 2,5-dipropoxyphenyl hydrogen hydrogen methyl methyl 2t'u 'l 7-ethyl hydrogen methyl methyl 3,4-diethylphenyl ll-propylamino hydrogen methyl methyl tetrahydro-Z-naphthyl 7-ethyl )ethyl propyl ethyl o-chlorophenyl hydrogen hydrogen methyl methyl phenyl S-ethyl hydrogen methyl methyl 2.5-dibutylphenyl hydrogen hydrogen methyl methyl phcnyl hydrogen hydrogen ethyl methyl p-chlorophenyl 7-ethoxy hydrogen methyl methyl m-ehlorophenyl hydrogen hydrogen methyl methyl EXAMPLE VI The hydrochloride salt is neutralized with sodium A mixture of 30 g. of 9h-(p-chlorophenyH-l2.3.9 tetrahydro-2.2-dimcthyl-H-imidazo[2.l-alisoindol- S-one, as prepared in Example I. and 100 ml. of 50% hydrochloric acid is heated in a steam bath. Solution occurs on heating for ten minutes; then solid begins to precipitate immediately. The mixture is cooled. filtered and washed with acetone to obtain 2-(2-amino-2- methylpropyl)-3-(p-chlorophenyl)-3- hydroxyphthalimidine hydrochloride. m.p. 230-232 C This hydrochloride salt is neutralized with sodium carbonate solution to obtain the corresponding phthalimidine base, m.p. 2()8-2l0 C., (recrystallized from ethanol).

EXAMPLE Vll A mixture of 45 g. of 9b-(p-fluorophenyl)-l,2,3,9btetrahydro-Z,2-dimethyl-5H-imidazo[2,l-alisoindol- 5-one, as prepared in Example II, and 150 ml. of 50% hydrochloric acid is heated in a steam bath. After minutes a clear solution forms; then solid begins to precipitate. The mixture is heated for an additional ten minutes, then cooled, filtered and washed with acetone. The solid obtained is 2-(2-amino-2- methylpropyl)-3-(p-lluorophenyH-B- hydroxyphthalimidine hydrochloride, l77-l80 C. dec.

hydrate m.p.

carbonate solution to obtain the phthalimidine base, m.p. l96-l99 c.

Anal. Calcd for C H N FO C, 68.78; H,

6.09. N, Found: C, 68.83; H, 6.18; N,

Similarly, 2-(2-amino-2-methylpropyl)-3-(3-bromop-tolyl)-3-hydroxyphthalimidine; 2-(2-amino2- methylpropyl)-3-hydroxy-6-methyl-3- phenylphthalimidine; and methylpropyl )-3-hydroxy-3-phenyl-4- propylphthalimidine.

EXAMPLE Vlll A mixture of 47 g. of l,2,3,9b-tetrahydroH9b-phenyl- 2,Z-dimethyl-SH-imidazol2,lu]isoindo|-5-one. as prepared in Example Ill. and ml. of 50% hydrochloric acid is heated on a steam bath. Clear solution forms within l5 minutes then reprecipitation occurs. After heating an additional 5 minutes, the mixture is cooled and filtered to obtain 2-(Z-amino-Z-methylpropyl)-3- hydroxy-3-phenylphthalimidine hydrochloride, m.p. 252-255 C. (dec.).

The above-prepared hydrochloride salt is neutralized with sodium carbonate solution to obtain the phthalimidine base, m.p. l72-l73 C.

2-( 2-amino-2- Anal. Calc'd for C H N O C, 72.94; H,

6.80; Found: C, 72.80; H, 6.93'

then reprecipitation occurs. After heating an additional 10 minutes, the mixture is cooled and filtered to obtain 2(2-amino-2-methylpropyl)-3-(p-bromophenyl)-3- hydroxyphthalimidine hydrochloride, m.p. 227230 C. (dec.).

The above-prepared hydrochloride salt is neutralized with sodium carbonate solution to obtain the phthalimidine base, m.p. l94-l96 C.

Anal. Calc'd for CWHWNZBQO: C. 57.6l; H. 5.]; N. 7.46. Found: C. 57.37; H. 5.19; N. 7.29.

EXAMPLE X When the procedure of Examples Vl-lX is repeated to hydrolize an appropriate 2.2-dialkyl-9b-aryll,2,3.9b-tetrahydro-H-imidazo[ 2, l -a]isoindol-5-one. as described in Example V. the corresponding 2-(2- amino-2.2-dialkylethyl)-3-aryl-3- hydroxyphthalimidine hydrohalide is afforded which is 12 2-(2-amino-2-methylpropyl)-3-(p-fluorophenyl)-3- hydroxyphthalimidine. m.p. l77-l80 C.;

2-(2-amino-2-m'ethylpropyl)-3-hydroxy-3- phenylphthalimidine. m.p. l72l73 C.; and l 2-(2-amino-2-methylpropyl)-3-(p-bromophenyl)-3- hydroxyphthalimidine. m.p. l94l96 C.

EXAMPLE Xll Anal. Calc'd for C ,,H,; ClN O.-,S: C. 64.24; H. 4.97; N. 6.00;

Cl. 7.60; S, 6.87.

C. 63.99; H. 4.83; N. 6.07; CI. 7.60; S. 6.80.

Found:

then neutralized to produce the bases thereof having the formula:

A solution of l0 g. of the above-prepared 9b-(pchlorophenyl)-l ,2.3 ,9b-tetrahydro-2.2-dimethyll ptolylsulfonyl)-5H-imidazo[2,l-a]isoindol-5-one and ml. of 85% sulfuric acid is allowed to stand at room R R temperature for 2 hours. The reaction mixture which 2 N-CH -C-NH contains the sulfate salt of 4-chloro-2-(4,4(5,5)-

dimethyl-2-imidazolin-2-yl)benzophenone is quenched 3 OH 5 with several volumes of ice water and made basic with concentrated sodium hydroxide solution. The precipi- 1 tated solid is separated and washed with water. On rel crystallization from ethanol there is obtained 5-(pwherem R4 and R5 as follows chlorophenyl)-2.3-dihydro-2,2(or 3.3)-dimethyl-5H- RI R2 I ll RI R5 p-iodophenyl 7-hromo hydrogen methyl methyl 3.4-dimethylphenyl S-methoxy hydrogen methyl ethyl p-methoxyphenyl 7-chloro 8-chloro methyl methyl trifluoromethylphenyl 7-methylamino hydrogen ethyl ethyl 2.5-dibromophenyl 7-methyl S-methyl methyl methyl 3.4-dimethoxyphenyl 6-etl1oxy hydrogen methyl methyl Z-thienyl 7-methoxy 8-methoxy butyl butyl p-propoxyphenyl 9-iodo hydrogen methyl methyl Z-pyridyl 7-fluoro 8-fluoro methyl butyl 2.5-dipropoxyphenyl v hydrogen hydrogen methyl methyl 2-fu *l 7-ethyl hydrogen methyl methyl 3.4-diethylphenyl 8-propylamino hydrogen methyl methyl 3.4-diethylphenyl S-propylamino hydrogen methyl methyl tctrahydro-Z-naphthyl 7-ethyl 9-ethyl propyl ethyl o-chlorophenyl hydrogen hydrogen methyl methyl phenyl 8-ethyl hydrogen methyl methyl 2.5-dibutylphenyl hydrogen hydrogen methyl methyl phenyl hydrogen hydrogen ethyl methyl p-chlorophenyl 7-ethoxy hydrogen methyl methyl m-chlorophenyl hydrogen hydrogen methyl methyl EXAMPLE Xl imidazo[2,l a]isoindol-5-ol. m.p. 20l-203 C. The acid chloride prepared from 26 g. of o-(pchlorobenzoyhbenzoic acid is dissolved in ml. of ac- Anfll- CulC'd far M H Q g 6 9 I 2 H. 5.49; N, 8.96; etone and is added dropwise with stirring to 35 ml. of ,0 ound; c,"(,s.x; H, 5.41; N. 9.05;

l.2-diamino-Z-methylpropane and 150 ml. of pyridine. The mixture is stirred and refluxed for 1 hour then evaporated to dryness in vacuo. The residue is slurried with water and separated by filtration. On recrystallization from ethanol there is obtained 2-(2-amino-2- ,5

methylpropyl)-3-(p-chlorophenyl)-3- hydroxyphthalimidine, m.p. 208-2l0 C.

In a similar manner, the acid halide of appropriate o-benzoylbenzoic acids are acylated to afford the following compounds:

Cl. ll.49.

IR (KBr) l.637cm", 2.222-2,739 cm- U.V. ('71 EtoH) max. 222m (e=22.20()) max. 263m 6,000)

max. 272m (e= 5.700)

(pH I) max. 263mg. (e=l2.960)

The compound of Example Xll possesses in addition to its antidepressant activity the property of markedly reducing sleep at dosage levels which produce no signs of agitation or stimulation.

EXAMPLE X111 hydroxy-Z-phthalimidinyl]-1,l-dimethylethyl)-ptoluenesulfonamide, m.p. 225-277 C.

Anal. Caled for C H- ClN- QS: C, 61.91; H, 5.20; N. 5.78;

CI. 7.31; S 6.61.

Found: C. 61.83; H, 5.00; N, 5.63;

A solution of g. of the above-prepared N-(2-[3-(pchlorophenyl)3-hydroxy-2-phthalimidinyl ]-l ,1- dimethylethyll-p-toluenesulfonamide and 40 ml. of 90% sulfuric acid is allowed to stand at room temperature for 45 minutes. The reaction mixture which contains the sulfate salt of 4-chloro-2-(4,4(5.5)-dimethyl- Z-imidazolin-Z-yl)benzophenone is quenched with several volumes of ice water and neutralized with concentrated sodium hydroxide solution. The solid is separated and washed with water. On recrystalliazation there is obtained 5-(p-chlorophenyl)-2,3-dihydro- 2,2(or 3,3)-dimethyl-5H-imidazo[2.l-a]isoindol-5- ol,m.p. 199202 C. identical by the usual criteria to that obtained in Example Xll.

A suspension of 1.5 g. of the above-prepared 5-(pchlorophenyl)-2.3-dihydro-2,2(or 3,3)-dimethyl-5H- imidazo [2,l-alisoindol-5-ol in 25 ml. of absolute ethanol is saturated with hydrogen chloride. The solution is evaporated to dryness in vacuo. The residue is triturated with ethyl acetate and separated by filtration. On recrystallization from ethanolethyl acetate mixture. there is obtained 4'-chloro-2-(4,4(5,5)-dimethyl-2- irnidazolin-Z-yl)benzophenone hydrochloride, m.p. 235238 C. dec.

Anal. Calc'd for C H N OCLHCl: C. 61.90; H, 5.19; N. 8.20; Cl. 20.30. Found: C. 61.59; H, 5.29; N; 8.20; CI. 2053.

IR (KBr) 1,670 cm, 2,5 58-2,941 cm U.V. (lsopropanol) max. 263 mu (6 12,460)

EXAMPLE XIV (1 6-111); H. 5.37; (yo-1.25; H.539;

N. (L3H. N. 6.11].

A solution of 22 g. of N-(2-[3-(p-fluorophenyl)-3- hydroxy-2-phthalimidinyl]-1 1 -dimethyl ethyl )-ptoluenesulfonamide, and 50 ml. of 90% sulfuric acid is allowed to stand at room temperature for 45 minutes.

5 The mixture which contains the sulfate salt of 4'- fluoro-2-(4,4(5,5-dimethyl-2-imidazolin-2-' yl)benzophenone is quenched with several volumes of ice water and neutralized with concentrated sodium hydroxide solution. The solid is separated and washed with water. On recrystallization from ethylacetate there is obtained 5-(p-fluorophenyl)-2.3-dihydro-2.2(or 3.3- )-dimethyl-5H-imidazo[2.l-a]isoindol-5-ol. m.p. 194 1 96 C.

Anal. Calc'd for C,,.H. N,F0; C. 72.96; H. 5.7)(; N. 9.45. Found: C, 72.88; H, 5.91; N. 9.45.

IR (KBr) 1,658 em", 2,273-2,278 cm" U.V. EtOH) max 260mg (e= 5,760) max 272mp 5,000) (pH 1) max 252mg. (e=l3 00()) On treating 5-(p-fluorophenyl)-2,3-dihydro2,2- dimethyl-5H-imidazo[2,l-a]isoindol-5-ol with hydrogen chloride, there is obtained 4-f1uoro-2-(4,4(5,5)- dimethyl-Z-imidazolin-Z-yl)benzophenone hydrochloride. M.P. 203-205 C.

Anal. Calcd for C H N FOHCl: C, 64.96; H, 5.45; N, 8.42.

Found: C, 64.79; H, 5.47; N, 8.39.

IR (KBr) 1,658 cm", 2,600-2,941 cm U.V. (isopropanol) max 250 mp. (e 12,100)

EXAMPLE XV A mixture of 27.5 g. of 2-(2amino-2-methylpropyl)- 3-hydroxy-3-phenyl phthalimidine, 20 g. of ptoluenesulfonyl chloride and 200 ml. of pyridine is relluxed for 8 hours. The solution is evaporated to dryness. The residue is triturated with water and separated by filtration. On recrystallization from 95% ethanol there is obtained N-(2-[3-phenyl-3-hydroxy-2- phthalimidinyl ]-1 ,l-dimethylethyl )-p-toluenesulfonamide, m.p. l97-200 C.

H, 5.81: N. 6.22 H, 5.70; N, 6.1?

Anal. (alc'd for H N Q C. 77.67; H. 6.52; N. 1007, Found: C. 77.44; H 0.04; N. 9.87.

IR (KBr) 1.645 cm", 2.273-2,790 em UV. (95% EtOH) max 260 mp (e= 4,900) max 272 m (1: 4.440 (pH 1) max 250 mp (513.480)

On treating -phenyl-2,3-dihydro-2,2(or 3.3)- dimethyl-5H-imidazo[2,l-a]isoindol-5-ol with hydrogen chloride, there is obtained 2-(4,4(5,5)-dimethyl-2- imidazolin-Z-yl)benzophenone, hydrochloride, m.p. l74l76 C.

C, 68.68; H. 6.08; N. 8.90. (1.68.86; H, 6.07; N. 8.87.

Anal. Calcd for C H N QHCI: Found:

IR (KBr) 1,645 cm, 2,564-3,077 cm U.V. (isopropanol) max. 249 mp. (e=l2,94()) EXAMPLE XVl A mixture of 16.8 g. of 2-(2-amino-2-methylpropyl)- 3-(p-bromophenyl)-3-hydroxyphthalimidine, g. of

Anal. Calc'd for C H N BrO: Found:

C, 60.51; H. 4.7 C. 60.51; H. 4.24

IR (KBr) 1,639 cm, 2,273-2,778 cm" U.V. (95% EtOH) max. 224 my. (e=Z4.4()0) max. 263 mp (e= 6.780)

max. 275 mp. (e= 6,400)

(pH 1) max. 267 my. (c=l3 64(l) On treating 5-(p-bromophenyl)-2,3-dihydro-2,2- dimethyl-5H-imidazo[2,l-u]isoindol-5-ol with hydrogen chloride there is obtained 4'-bromo-2-(4,4(5,5)- dimethyl-Z-imidazolin-Z-yl)benzophenone. hydrochloride. m.p. 222-225 C.

Anal. Calc'd rm C H BrN OHClz Found: C. 55.09; H 4.67;

p-toluene-sulfonyl chloride and 100 ml. of pyridine is refluxed for 8 hours. The solution is evaporated to dryness and the residue is partitioned between ethyl acetate and water. The ethyl acetate portion is evaporated to a solid residue. On recrystallization from ethanol there is obtained N-(2-[3-(p-bromophenyl)-3-hydroxy- IR (KBr) 1,661 cm", 2,500-2,94 l cm U.V. (lsopropanol) max. 267mp. (e 14,500)

EXAMPLE XVll When the procedure of Examples Xlll-XVl is rez-phrh li idi yn-l ,1-di th l h peated to react appropriate 2-(2-amino-2-alkylalkyl-3- toluene ulfonamide, m, 234-237 C aryl-3-hydroxyphthalimidine hydrohalide with aryl or alkyl sulfonyl halides, there is afforded the following t s 76 5 N-([3-aryl-3-hydroxy-2-phthalimidinyl]-l,l-dialkylalk- Anal Calcd for fi-gz aj' g: 23:; #3 3 yl)sulfonamides (l) which are then contacted with sulfuric acid to afford appropriate sulfate salts of 4,4(5,5 A solution of 11 g, of N-(2-[3-( b hen l)-3- dialkyl-2-imidazolin-Z-yl-phenyl aroyl compounds (ll) hydroxy-Z-phthalimidinyl]-l ,l-dimethylethyl)-pwhich are neutralized to afford appropriate 2,2(or 3,3- toluenesulfonamide and ml. of 90% sulfuric acid is i lkyl-5- ryl-2,3- hy r -5 mi z l allowed to stand at room temperature for 45 minutes. li ("U which m y be idifi d -g. hydro- The solution which contains the sulfate salt of 4- 40 chloric acid, to afford the corresponding 4,4(5,5 bromo-(4,4(5,S)-dimethyl-2-imidazolin 2- dialkyl-Z-imidazolin-2-yl phenyl aroyl compound acidyl)benzophenone is quenched with several volumes of addition salts (IV) e.g. hydrochloride, which com ice water and neutralized with concentrated sodium hypounds (I), (ll), (Ill) and (IV) are depicted by the foldroxide solution. The solid is separated and washed lowing formulae:

oI R 4 u M R R N R 2 N-CH CH-NHSO R 2 a 5 k OH I 2 7 l -1/2 H R R 1 5 M H R I N 5 R, 1

c=o R on HCl 3 R1 I R1 (III) 17 wherein R,. R R R R and R are defined below:

18 IR (KBr) 1,645 cm", 2.380-3.000 cm" 1 2 ii R4 p-iodophenyl 7-hromo hydrogen methyl methyl ethyl 3.4dimethylphenyl X-methoxy hydrogen methyl ethyl phe ml p-mcthoxyphenyl 7-ehloro X-chloro methyl methyl p-chlorophenyl trilluuromethylphenyl 7-methylamino hydrogen ethyl ethyl phenyl 2,5-dihromophenyl 7-methyl X-methyl methyl methyl p-hromophenyl 3.4-dimethoxyphenyl 6-ethoxy hydrogen methyl methyl J-ethylpltenyl Z-Ihienyl 7-methoxy X methoxy hutyl hutyl 3.-l-dimethylphenyl p-propoxyphenyl 9'iodo hydrogen methyl methyl phenyl Z-pyridyl 7-fluoro fil-fluoro methyl htltyl Lidichlorophenyl 2. dipropoxyphenyl hydrogen hydrogen methyl methyl pentyl Z-furyl 7ethyl hydrogen methyl methyl 3.4-dihromophenyl 3.-l diethylphenyl X-propylamino hydrogen methyl methyl p-iodophenyl tetrahydro2-naphthyl 7-ethyl 9-ethyl propyl ethyl p-methoxyphenyl o-ehlorophenyl hydrogen hydrogen methyl methyl p-iodophenyl phenyl X-ethyl hydrogen methyl methyl 3.4-difluorophenyl 2.5-dihutylphenyl hydrogen hydrogen methyl methyl p-ethoxyphenyl phenyl hydrogen hydrogen ethyl methyl 3,4-diethylphenyl p-chlorophenyl 7-ethoxy hydrogen methyl methyl p-fluorophenyl m-chlorophenyl hydrogen hydrogen methyl methyl pethoxyphenyl EXAMPLE XVI" U.V. (95% EtOH) max. 223 mp. (Fl) 000) infl. 242.5 ma (F8300) A solution of 21.5 g. of 2-(2-aminoethyU-3-(p- 268-5 (F4400) hl h l 3 h d h h l. .d. l3 3 f max. 272 my (F4400) L P y QP t 2 9 (pH llmax. l ma $11000; p-toluene-sulfonyl chloride and 150 ml. of pyridine 1s 264 l- (FHLXUU) allowed to stand at room temperature for 18 hours. The 25 mixture is quenched with water and extracted with On treatmg -(pph nyl)- lhy r0- H- ethyl acetate. The ethyl acetate portion is evaporated to dryness and the residue crystallizes on standing for three days. On recrystallization from aqueous ethanol there is obtained N-(Z-l 3(p-chlorophcnyl)-3-hydroxy- 2-phthalimidinyllethyl)-p-toluenesulfonamide, m.p. l33l 36 C.

Anal. Calcd for C ;,H. N O;SCl: C 60.32; H, 4.84; N 6. l2;

Clv 7.74.

Found: C. 60.54; H 4.50; N 6.08;

Clv 7.56.

C, 67.49; H, 4.60; N. 9.84;

Cl. 12.45. C. 67.18; H, 4.32; N 9.68;

Anal. Calc'd for C H N OCI:

Found:

2.3-dihydro-54 4'-tolyl -5 H-imidalol 2. l -a Iisointlol m.p. 5O

imidazo[2,l-a]isoindol-5-ol with hydrogen chloride,

there is obtained 4'-chloro-2-(2-imidazolin-2- yl)bcnzophenone hydrochloride, m.p. l-l72 C.

Anal. Calc'd for C H N CIOHCI: C 59.80; H. 4.40;

N. 8.72; Cl. 210K. Found: C, 59.63; H; 4.50;

N. 8.72; CI. 2L7).

IR (KBr) 1,647 cm, 2,3003,200 cm U.V. EtOH) max. 252 my (e=l2,l00) max. 265 mu (6 12.300) (lsopropanol) max. 264 mp t=l L000) EXAM PLE XlX When the procedure of Example XXll is repeated to react 2(Z-aminoethyl)-3-aryl-3-hydroxyphthalimidine or hydrohalides with appropriate aryl or alkyl sulfonyl halides, there is afforded N-(2-[3-aryl-3-hydroxy-2- phthalimidinyl]alkyl)sulfonamides which are contacted with sulfuric acid to afford sulfate salts of Z-imidazolin-Z-yl-phenyl aroyl compounds which are neutralized to yield the following 5-aryl-2.3-dihydro- SH-imidazolZ,l-alisoindol-S-ols which are acidified e.g. hydrochloric acid to produce their corresponding hereinafter listed 2-imidazolin-2-yl phenyl aroyl compound acid-addition salts e.g. hydrochlorides.

Z-lMlDAZ()l.lN-Z-YL PHliNYl. AROYl. COMPOUND HYDROCHLORIDl-IS 2-( Z-imidazolin-Z-yl 3,4 -diiotlohenzophenone hydrochloride 3'.4 diethoxy-3-( Z- itnitl'.t1.olin-2-yl lltenlophenotte hydrochloride 2-( Z-imidamlin-Z-yl )-4- methylbenzophenone hydro chloride Table Continued -ARYL-2.3 DlHYDRO-5- [MI DAZO[2.l-allSOIN DOL -5-OLS Z-lMlDAZOLlN-Z-YL PHENYL AROYL COMPOUND HYDROCHLORIDES il-amyl-2,3-dihydro-5-phenyl- SH-imidazol 2. I a ]isoindol-5- ol 4-amy|-2-( Z-imidazolin-l yllhenzophenone hydrochloride l3 dihydro-5-phenyl-7-propyl 5H-imidazol 2.] alisoindol-S- 5H-imidazol 2, l a Iisoindol-S- ol 4-hutoxy-24 limidazolin- 2- \'l )hcnzophenone h \'dro chloride 2.3-dihydro-5-t 3.4 dimethyl phenyh-SH-imidazol 2.1-:1] isoindol-S-ol 2'( Z-imidazolin-Z-yl J- 3 .4

chloride 2.3-dihydro-5-( 4-propoxyphenyl )-5H-imidazol 2. 1 alisoindo|-5-ol chloride propylhenzophenone hydrodimel hylhenzophenone hydropropoxyhenzophenone hydro- EXAMPLE XX Anal. Calc'd for C H N O S Found EXAMPLE XXI Anal. Culcd for C H N O Found 1 H. 5.63; N. ll. C, 76.63. ll

IR (KBr) 1,645 cm", 2,3003,000 cm UV. EtOH] inf. 225 mp. (e=l4.900)

max. 268 mp. (F4200) (ph I) max. 250 mu (e=l3,500)

On treating 5-phenyl-2,S-dihydro-SH-imidazoi2,la]-isoindol-5-ol with hydrogen chloride, there is obtained 2-(2-imidazolin-2-yl)benzophenone hydrochloride, m.p. l95-l97 C. (dec.).

What is claimed is: l. A compound selected from the group consisting of those having the formula:

wherein R, is selected from the group consisting of phenyl, monohalophenyl, dihalophenyl, mono(lower)alkylphenyl, di(lower)alkylphenyl. trifluoromethylphenyl, mono(lower)alkoxyphenyl, diOlower- )alkoxyphenyl; R and R are selected from the group consisting of hydrogen and lower alkyl; R,- is selected from the group consisting of lower alkylsulfonyl, phenylsulfonyl, monohalophenylsulfonyl, dihalophenylsulfonyl, mono(lower)alkylphenylsulfonyl, di(lowcr)alkylphenylsull'onyl and lower alkoxyphenylsulfonyl.

2. A compound as described in claim 1 which is: N- (2-[B-(p-chlorophenyl)-3-hydroxy-2-phthalimidinyll- 1.ldimethylethyl)-p-toluenesulfonamide.

3. A compound as described in claim 1 which is; N- (Z-l3-(p-fluorophenyl)-3-hydroxy-2phthalimidinyl]- 1,1-dimethylethyl )-p-toluenesulfonamide.

4. A compound as described in claim 1 which is: N- (2-[3-hydroxy-3phenyl-S-phthalimidinyl]-l,ldimethylethyl)-p-toluenesulfonamide.

5. A compound as described in claim 1 which is: N- (2-[3-(p-bromophenyl)-3hydroxy-Z-phthalimidinyl]- l,ldimethylethyl)-p-toluenesulfonamide.

6. A compound as described in claim 1 which is: N- (2-[3-(p-chlorophenyl)-3-hydroxy-2- phthalimidinyllethyl)-p-toluenesulfonamide.

7. A compound as described in claim 1 which is: N- (2-[3-hydroxy-3-phenyl-2-phthalimidinyl]ethyl)-ptoluenesulfonamide.

Anal. (ulctl for ll,,N. .().ll('l: (167.03; H. 5.27. N 0.77.

Found. (1:088; H, 5 l l N LHL IR (KBr) L650 cm, 2,400-3,200 cm U.Vv (95% EtOH) max. 250 my. (5 12,800). 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE FORMULA:
 2. A compound as described in claim 1 which is: N-(2-(3-(p-chlorophenyl)-3-hydroxy-2-phthalimidinyl)-1,1-dimethylethyl)-p -toluenesulfonamide.
 3. A compound as described in claim 1 which is: N-(2-(3-(p-fluorophenyl)-3-hydroxy-2-phthalimidinyl)-1,1-dimethylethyl)-p -toluenesulfonamide.
 4. A compound as described in claim 1 which is: N-(2-(3-hydroxy-3-phenyl-2-phthalimidinyl)-1,1-dimethylethyl)-p -toluenesulfonamide.
 5. A compound as described in claim 1 which is: N-(2-(3-(p-bromophenyl)-3-hydroxy-2-phthalimidinyl)-1,1-dimethylethyl)-p -toluenesulfonamide.
 6. A compound as described in claim 1 which is: N-(2-(3-(p-chlorophenyl)-3-hydroxy-2-phthalimidinyl)ethyl)-p -toluenesulfonamide.
 7. A compound as described in claim 1 which is: N-(2-(3-hydroxy-3-phenyl-2-phthalimidinyl)ethyl)-p-toluenesulfonamide. 